Talk:2010 Polish Air Force Tu-154 crash

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Edit request on 01 May 2013[edit]

The first paragraph in the section "Warning signs" contains incorrect conclusions based on potentially potentially unrelated information. While the information cited from the FAA's "Airplane Flying Handbook" is largely correct, it is incredibly general in nature and by no means speaks to the specific performance characteristics of the D-30 engines of the Tupolev Tu-154, or that of any other jet engine for that matter. The statement that "engine spool-up is nearly instantaneous over 78% N2" might be correct, but unless we refer to the aircraft manual or to actual flight test data for that type of engine under those operating conditions there is no way that statement can be correct. Also, the statement that a jet engine can take up to eight seconds to spool up from idle to maximum thrust is potentially incorrect as well; current FAA regulations require five second spool-up times; older regulations allowed longer spool-up times - when that manual was published, regulations at the time might have allowed eight-second spool-up. Beyond that, as the D-30 engines on the TU-154 were not only designed in the early 1970s, they were never certified by the FAA, so there might very well not have been any kind of spool-up time requirement when that engine was designed and certified. I can't speak to the state of aircraft certification regulations in the Soviet Union during the 1970s, though.

I suggest editing that paragraph to state that the TU-154's engines were at idle descending through 200 meters; the operator's manual requires a go-around if the engines are running at below 75% N2 while descending through 200 meters. Mentioning that jet engines take a considerable period of time to spool-up is important; just a quick citation from the FAA's "Airplane Flying Handbook" is enough without the need to go into the overly generalised numbers that book presents.

Thank you.

Background: I hold a Canadian Airline Transport Pilot License with over 3000 hours of turbine-powered flight experience.


I fully agree with your concerns for maximum accuracy. This is were Wikipedia lacks the most, thus making it quite an unreliable source of information. This article, however, is not so bad after all.
The D-30KU-154 engines of the Tu-154M take 8.5...10 seconds to accelerate from flight idle to TOGA power.
If established on the ILS with a normal power setting, the engines need only 2.5...3 seconds to accelerate.
I would add that bit of information to the article myself (including the reference), but for some unknown reason, the edit function is not available anymore.
Best regards,
Alexey, happily retired F/E (Il-18, Il-62, Tu-144, Tu-154) — Preceding unsigned comment added by 195.246.100.57 (talk) 12:12, 10 July 2014 (UTC)


@195.246.100.57: - Alexey, I've changed the protection level on the article. You should now be able to edit freely. Mjroots (talk) 07:22, 11 July 2014 (UTC)